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Abstract
As fixed organisms, plants are especially affected by changes in their environment
and have consequently evolved extensive mechanisms for acclimation and adaptation.
Initially considered by-products from aerobic metabolism, reactive oxygen species
(ROS) have emerged as major regulatory molecules in plants and their roles in early
signaling events initiated by cellular metabolic perturbation and environmental stimuli
are now established. Here, we review recent advances in ROS signaling. Compartment-specific
and cross-compartmental signaling pathways initiated by the presence of ROS are discussed.
Special attention is dedicated to established and hypothetical ROS-sensing events.
The roles of ROS in long-distance signaling, immune responses, and plant development
are evaluated. Finally, we outline the most challenging contemporary questions in
the field of plant ROS biology and the need to further elucidate mechanisms allowing
sensing, signaling specificity, and coordination of multiple signals.
[1
]Organismal and Evolutionary Biology Research Programme, Faculty of Biological and
Environmental Sciences, and Viikki Plant Science Centre, University of Helsinki, 00014
Helsinki, Finland;